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libvips/libvips/conversion/conversion.c

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/* base class for all conversion operations
*
* properties:
* - single output image
*/
/*
Copyright (C) 1991-2005 The National Gallery
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
/*
#define DEBUG
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <glib/gi18n-lib.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <vips/vips.h>
#include <vips/internal.h>
#include "pconversion.h"
/**
* SECTION: conversion
* @short_description: convert images in some way: change band format, change header, insert, extract, join
* @see_also: <link linkend="libvips-resample">resample</link>
* @stability: Stable
* @include: vips/vips.h
*
* These operations convert an image in some way. They can be split into a two
* main groups.
*
* The first set of operations change an image's format in some way. You
* can change the band format (for example, cast to 32-bit unsigned
* int), form complex images from real images, convert images to
* matrices and back, change header fields, and a few others.
*
* The second group move pixels about in some way. You can flip, rotate,
* extract, insert and join pairs of images in various ways.
*
*/
/**
* vips_composite:
* @in: (array length=n) (transfer none): array of input images
* @out: (out): output image
* @n: number of input images
* @mode: array of (@n - 1) #VipsBlendMode
* @...: %NULL-terminated list of optional named arguments
*
* Optional arguments:
*
* * @compositing_space: #VipsInterpretation to composite in
* * @premultiplied: %gboolean, images are already premultiplied
* * @x: #VipsArrayInt, position of subimages
* * @y: #VipsArrayInt, position of subimages
*
* Composite an array of images together.
*
* Images are placed in a stack, with @in[0] at the bottom and @in[@n - 1] at
* the top. Pixels are blended together working from the bottom upwards, with
* the blend mode at each step being set by the corresponding #VipsBlendMode
* in @mode.
*
* Images are transformed to a compositing space before processing. This is
* #VIPS_INTERPRETATION_sRGB, #VIPS_INTERPRETATION_B_W,
* #VIPS_INTERPRETATION_RGB16, or #VIPS_INTERPRETATION_GREY16
* by default, depending on
* how many bands and bits the input images have. You can select any other
* space, such as #VIPS_INTERPRETATION_LAB or #VIPS_INTERPRETATION_scRGB.
*
* The output image is in the compositing space. It will always be
* #VIPS_FORMAT_FLOAT unless one of the inputs is #VIPS_FORMAT_DOUBLE, in
* which case the output will be double as well.
*
* Complex images are not supported.
*
* The output image will always have an alpha band. A solid alpha is
* added to any input missing an alpha.
*
* The images do not need to match in size or format. They will be expanded to
* the smallest common size and format in the usual way. Images are positioned
* using the @x and @y parameters, if set.
*
* Image are normally treated as unpremultiplied, so this operation can be used
* directly on PNG images. If your images have been through vips_premultiply(),
* set @premultiplied.
*
* See also: vips_insert().
*
* Returns: 0 on success, -1 on error
*/
/**
* vips_composite2: (method)
* @base: first input image
* @overlay: second input image
* @out: (out): output image
* @mode: composite with this blend mode
* @...: %NULL-terminated list of optional named arguments
*
* Optional arguments:
*
* * @compositing_space: #VipsInterpretation to composite in
* * @premultiplied: %gboolean, images are already premultiplied
* * @x: %gint, position of overlay
* * @y: %gint, position of overlay
*
* Composite @overlay on top of @base with @mode. See vips_composite().
*
* Returns: 0 on success, -1 on error
*/
/**
* VipsBlendMode:
* @VIPS_BLEND_MODE_CLEAR: where the second object is drawn, the first is removed
* @VIPS_BLEND_MODE_SOURCE: the second object is drawn as if nothing were below
* @VIPS_BLEND_MODE_OVER: the image shows what you would expect if you held two semi-transparent slides on top of each other
* @VIPS_BLEND_MODE_IN: the first object is removed completely, the second is only drawn where the first was
* @VIPS_BLEND_MODE_OUT: the second is drawn only where the first isn't
* @VIPS_BLEND_MODE_ATOP: this leaves the first object mostly intact, but mixes both objects in the overlapping area
* @VIPS_BLEND_MODE_DEST: leaves the first object untouched, the second is discarded completely
* @VIPS_BLEND_MODE_DEST_OVER: like OVER, but swaps the arguments
* @VIPS_BLEND_MODE_DEST_IN: like IN, but swaps the arguments
* @VIPS_BLEND_MODE_DEST_OUT: like OUT, but swaps the arguments
* @VIPS_BLEND_MODE_DEST_ATOP: like ATOP, but swaps the arguments
* @VIPS_BLEND_MODE_XOR: something like a difference operator
* @VIPS_BLEND_MODE_ADD: a bit like adding the two images
* @VIPS_BLEND_MODE_SATURATE: a bit like the darker of the two
* @VIPS_BLEND_MODE_MULTIPLY: at least as dark as the darker of the two inputs
* @VIPS_BLEND_MODE_SCREEN: at least as light as the lighter of the inputs
* @VIPS_BLEND_MODE_OVERLAY: multiplies or screens colors, depending on the lightness
* @VIPS_BLEND_MODE_DARKEN: the darker of each component
* @VIPS_BLEND_MODE_LIGHTEN: the lighter of each component
* @VIPS_BLEND_MODE_COLOUR_DODGE: brighten first by a factor second
* @VIPS_BLEND_MODE_COLOUR_BURN: darken first by a factor of second
* @VIPS_BLEND_MODE_HARD_LIGHT: multiply or screen, depending on lightness
* @VIPS_BLEND_MODE_SOFT_LIGHT: darken or lighten, depending on lightness
* @VIPS_BLEND_MODE_DIFFERENCE: difference of the two
* @VIPS_BLEND_MODE_EXCLUSION: somewhat like DIFFERENCE, but lower-contrast
*
* The various Porter-Duff and PDF blend modes. See vips_composite(),
* for example.
*
* The Cairo docs have a nice explanation of all the blend modes:
*
* https://www.cairographics.org/operators
*
* The non-separable modes are not implemented.
*/
/**
* VipsAlign:
* @VIPS_ALIGN_LOW: align low coordinate edge
* @VIPS_ALIGN_CENTRE: align centre
* @VIPS_ALIGN_HIGH: align high coordinate edge
*
* See vips_join() and so on.
*
* Operations like vips_join() need to be told whether to align images on the
* low or high coordinate edge, or centre.
*
* See also: vips_join().
*/
/**
* VipsAngle:
* @VIPS_ANGLE_D0: no rotate
* @VIPS_ANGLE_D90: 90 degrees clockwise
* @VIPS_ANGLE_D180: 180 degree rotate
* @VIPS_ANGLE_D270: 90 degrees anti-clockwise
*
* See vips_rot() and so on.
*
* Fixed rotate angles.
*
* See also: vips_rot().
*/
/**
* VipsInteresting:
* @VIPS_INTERESTING_NONE: do nothing
* @VIPS_INTERESTING_CENTRE: just take the centre
* @VIPS_INTERESTING_ENTROPY: use an entropy measure
* @VIPS_INTERESTING_ATTENTION: look for features likely to draw human attention
* @VIPS_INTERESTING_LOW: position the crop towards the low coordinate
* @VIPS_INTERESTING_HIGH: position the crop towards the high coordinate
* @VIPS_INTERESTING_ALL: everything is interesting
*
* Pick the algorithm vips uses to decide image "interestingness". This is used
* by vips_smartcrop(), for example, to decide what parts of the image to
* keep.
*
* #VIPS_INTERESTING_NONE and #VIPS_INTERESTING_LOW mean the same -- the
* crop is positioned at the top or left. #VIPS_INTERESTING_HIGH positions at
* the bottom or right.
*
* See also: vips_smartcrop().
*/
/**
* VipsCompassDirection:
* @VIPS_COMPASS_DIRECTION_CENTRE: centre
* @VIPS_COMPASS_DIRECTION_NORTH: north
* @VIPS_COMPASS_DIRECTION_EAST: east
* @VIPS_COMPASS_DIRECTION_SOUTH: south
* @VIPS_COMPASS_DIRECTION_WEST: west
* @VIPS_COMPASS_DIRECTION_NORTH_EAST: north-east
* @VIPS_COMPASS_DIRECTION_SOUTH_EAST: south-east
* @VIPS_COMPASS_DIRECTION_SOUTH_WEST: south-west
* @VIPS_COMPASS_DIRECTION_NORTH_WEST: north-west
*
* A direction on a compass. Used for vips_gravity(), for example.
*/
/**
* VipsAngle45:
* @VIPS_ANGLE45_D0: no rotate
* @VIPS_ANGLE45_D45: 45 degrees clockwise
* @VIPS_ANGLE45_D90: 90 degrees clockwise
* @VIPS_ANGLE45_D135: 135 degrees clockwise
* @VIPS_ANGLE45_D180: 180 degrees
* @VIPS_ANGLE45_D225: 135 degrees anti-clockwise
* @VIPS_ANGLE45_D270: 90 degrees anti-clockwise
* @VIPS_ANGLE45_D315: 45 degrees anti-clockwise
*
* See vips_rot45() and so on.
*
* Fixed rotate angles.
*
* See also: vips_rot45().
*/
/**
* VipsExtend:
* @VIPS_EXTEND_BLACK: extend with black (all 0) pixels
* @VIPS_EXTEND_COPY: copy the image edges
* @VIPS_EXTEND_REPEAT: repeat the whole image
* @VIPS_EXTEND_MIRROR: mirror the whole image
* @VIPS_EXTEND_WHITE: extend with white (all bits set) pixels
* @VIPS_EXTEND_BACKGROUND: extend with colour from the @background property
*
* See vips_embed(), vips_conv(), vips_affine() and so on.
*
* When the edges of an image are extended, you can specify
* how you want the extension done.
*
* #VIPS_EXTEND_BLACK --- new pixels are black, ie. all bits are zero.
*
* #VIPS_EXTEND_COPY --- each new pixel takes the value of the nearest edge
* pixel
*
* #VIPS_EXTEND_REPEAT --- the image is tiled to fill the new area
*
* #VIPS_EXTEND_MIRROR --- the image is reflected and tiled to reduce hash
* edges
*
* #VIPS_EXTEND_WHITE --- new pixels are white, ie. all bits are set
*
* #VIPS_EXTEND_BACKGROUND --- colour set from the @background property
*
* We have to specify the exact value of each enum member since we have to
* keep these frozen for back compat with vips7.
*
* See also: vips_embed().
*/
/**
* VipsDirection:
* @VIPS_DIRECTION_HORIZONTAL: left-right
* @VIPS_DIRECTION_VERTICAL: top-bottom
*
* See vips_flip(), vips_join() and so on.
*
* Operations like vips_flip() need to be told whether to flip left-right or
* top-bottom.
*
* See also: vips_flip(), vips_join().
*/
G_DEFINE_ABSTRACT_TYPE( VipsConversion, vips_conversion, VIPS_TYPE_OPERATION );
static int
vips_conversion_build( VipsObject *object )
{
VipsConversion *conversion = VIPS_CONVERSION( object );
#ifdef DEBUG
printf( "vips_conversion_build: " );
vips_object_print_name( object );
printf( "\n" );
#endif /*DEBUG*/
g_object_set( conversion, "out", vips_image_new(), NULL );
if( VIPS_OBJECT_CLASS( vips_conversion_parent_class )->build( object ) )
return( -1 );
return( 0 );
}
static void
vips_conversion_class_init( VipsConversionClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
vobject_class->nickname = "conversion";
vobject_class->description = _( "conversion operations" );
vobject_class->build = vips_conversion_build;
VIPS_ARG_IMAGE( class, "out", 2,
_( "Output" ),
_( "Output image" ),
VIPS_ARGUMENT_REQUIRED_OUTPUT,
G_STRUCT_OFFSET( VipsConversion, out ) );
}
static void
vips_conversion_init( VipsConversion *conversion )
{
}
/* Called from iofuncs to init all operations in this dir. Use a plugin system
* instead?
*/
void
vips_conversion_operation_init( void )
{
extern GType vips_copy_get_type( void );
extern GType vips_tile_cache_get_type( void );
extern GType vips_line_cache_get_type( void );
extern GType vips_sequential_get_type( void );
extern GType vips_cache_get_type( void );
extern GType vips_embed_get_type( void );
extern GType vips_gravity_get_type( void );
extern GType vips_flip_get_type( void );
extern GType vips_insert_get_type( void );
extern GType vips_join_get_type( void );
extern GType vips_arrayjoin_get_type( void );
extern GType vips_extract_area_get_type( void );
extern GType vips_crop_get_type( void );
extern GType vips_smartcrop_get_type( void );
extern GType vips_extract_band_get_type( void );
extern GType vips_replicate_get_type( void );
extern GType vips_cast_get_type( void );
extern GType vips_bandjoin_get_type( void );
extern GType vips_bandjoin_const_get_type( void );
extern GType vips_bandrank_get_type( void );
extern GType vips_black_get_type( void );
extern GType vips_rot_get_type( void );
extern GType vips_rot45_get_type( void );
extern GType vips_autorot_get_type( void );
extern GType vips_ifthenelse_get_type( void );
extern GType vips_switch_get_type( void );
extern GType vips_recomb_get_type( void );
extern GType vips_bandmean_get_type( void );
extern GType vips_bandfold_get_type( void );
extern GType vips_bandunfold_get_type( void );
extern GType vips_flatten_get_type( void );
extern GType vips_premultiply_get_type( void );
extern GType vips_unpremultiply_get_type( void );
extern GType vips_bandbool_get_type( void );
extern GType vips_gaussnoise_get_type( void );
extern GType vips_grid_get_type( void );
extern GType vips_transpose3d_get_type( void );
extern GType vips_scale_get_type( void );
extern GType vips_wrap_get_type( void );
extern GType vips_zoom_get_type( void );
extern GType vips_subsample_get_type( void );
extern GType vips_msb_get_type( void );
extern GType vips_byteswap_get_type( void );
extern GType vips_xyz_get_type( void );
extern GType vips_falsecolour_get_type( void );
extern GType vips_gamma_get_type( void );
extern GType vips_composite_get_type( void );
extern GType vips_composite2_get_type( void );
vips_copy_get_type();
vips_tile_cache_get_type();
vips_line_cache_get_type();
vips_sequential_get_type();
vips_cache_get_type();
vips_embed_get_type();
vips_gravity_get_type();
vips_flip_get_type();
vips_insert_get_type();
vips_join_get_type();
vips_arrayjoin_get_type();
vips_extract_area_get_type();
vips_crop_get_type();
vips_smartcrop_get_type();
vips_extract_band_get_type();
vips_replicate_get_type();
vips_cast_get_type();
vips_bandjoin_get_type();
vips_bandjoin_const_get_type();
vips_bandrank_get_type();
vips_black_get_type();
vips_rot_get_type();
vips_rot45_get_type();
vips_autorot_get_type();
vips_ifthenelse_get_type();
vips_switch_get_type();
vips_recomb_get_type();
vips_bandmean_get_type();
vips_bandfold_get_type();
vips_bandunfold_get_type();
vips_flatten_get_type();
vips_premultiply_get_type();
vips_unpremultiply_get_type();
vips_bandbool_get_type();
vips_gaussnoise_get_type();
vips_grid_get_type();
vips_transpose3d_get_type();
vips_scale_get_type();
vips_wrap_get_type();
vips_zoom_get_type();
vips_subsample_get_type();
vips_msb_get_type();
vips_byteswap_get_type();
vips_xyz_get_type();
vips_falsecolour_get_type();
vips_gamma_get_type();
vips_composite_get_type();
vips_composite2_get_type();
}
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